MCQOPTIONS
Saved Bookmarks
This section includes 8 Mcqs, each offering curated multiple-choice questions to sharpen your Mechanical Metallurgy knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
The burger vector is perpendicular to the dislocation line in ____________ while it is parallel for ________________ |
| A. | screw dislocation, edge dislocation |
| B. | edge dislocation, screw dislocation |
| C. | edge dislocation, mixed dislocation |
| D. | mixed dislocation, screw dislocation |
| Answer» C. edge dislocation, mixed dislocation | |
| 2. |
A pure edge dislocation can move in direction perpendicular to its length by _________ however, it may move vertically (along its length) by a process known as ______ |
| A. | glide, climb |
| B. | climb, glide |
| C. | kink, glide |
| D. | kink, jog |
| Answer» B. climb, glide | |
| 3. |
In a positive edge dislocation, the atomic arrangement results in a ____________ above the slip plane and a ______________ below the slip plane. |
| A. | compressive stress, tensile stress |
| B. | tensile stress, compressive stress |
| C. | compressive stress, compressive stress |
| D. | tensile stress, tensile stress |
| Answer» B. tensile stress, compressive stress | |
| 4. |
The dislocation is considered as the region of localized lattice disturbance separating the slipped and unslipped areas in a crystal. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 5. |
For a given metal, the energy required to move an atom from the interior of a crystal to its surface is E=1eV (0.16*10-18). Find the fraction of the vacant lattice site in metal at 500 degree Celsius. |
| A. | 3.06*10<sup>-7</sup> |
| B. | 1.02*10<sup>-10</sup> |
| C. | 6.27*10<sup>-3</sup> |
| D. | 8.2*10<sup>-18</sup> |
| Answer» B. 1.02*10<sup>-10</sup> | |
| 6. |
Which of the following defect is a thermodynamically stable defect? |
| A. | Vacancy |
| B. | Interstitial atom |
| C. | Dislocation |
| D. | Stacking fault |
| Answer» B. Interstitial atom | |
| 7. |
Which of the following is Not a structure sensitive property? |
| A. | Yield strength |
| B. | Fracture Strength |
| C. | Semiconductor property |
| D. | Specific heat |
| Answer» E. | |
| 8. |
Which of the following is Not a structure insensitive property? |
| A. | Elastic modulus |
| B. | Melting point |
| C. | Coefficient of thermal expansion |
| D. | Electrical resistivity |
| Answer» E. | |